Disinfecting aerosol compositions

ABSTRACT

DISINFECTING AEROSOL COMPOSITIONS COMPRISING PYRIDINIUM HALIDE SALTS ADMIXED WITH A TERPENE, TOGETHER WITH A PROPELLANT IN AN AEROSOL CONTAINER PROVIDE EFFECTIVE SYNERGIZED BACTERIOSTATIC ACTION. IN PARTICULAR, AFFECTIVE DISINFCTING AEROSOL COMPOSITIONS OF BOTH A RESIDUAL AND AN AIR-SANTIZING TYPE ARE PREPARED BY A SPRAYABLE COMPOSITION COMPRISING CETYL PYRIDINIUM BROMIDE, CITRAL AND A PROPELLANT.

United States Patent U.S. Cl. 424-45 11 Claims ABSTRACT OF THE DISCLOSURE 'Disinfecting aerosol compositions comprising pyridinium halide salts admixed with a terpene, together with a propellant in an aerosol container provide effective synergized bacteriostatic action. In particular, effective disinfecting aerosol compositions of both a residual and an air-santizing type are prepared by a sprayable composition comprising cetyl pyridinium bromide, citral and a propellant.

This application is a continuation-in-part of copending application U.S. Ser. No. 854,009, filed July 29, 1969, now US. Pat. 3,595,975, which patent is a streamlined continuation of US. Ser. No. 500,225, filed Oct. 21, 1965, which is a continuation of US. Ser. No. 179,778, filed Mar. 14, 1962, both now abandoned.

BACKGROUND OF THE INVENTION The control of fungal growth presents a serious problem in many industries, institutions, and in medicine. In addition, control of bacteria, algae and other microscopic forms of animal and plant life is important. Means for inhibiting the growth of microorganisms have hitherto been only partly successful. While numerous substances have been shown to have antimicrobial properties, the disadvantages of many of these limit their usefulness; for example, they may be truly effective only when used in such heavy concentrations that they are uneconomical, hazardous, or toxic.

The substance phenol, also known as phenol hydrate and carbolic acid, has been one of the most widely used disinfectant substances. Because it is adsorbed by intact skin, by Wound tissue, and by mucous membranes, its usefulness is limited to such dilute concentrations that its antimicrobial activity is necessarily reduced. The toxicity and adverse side efiects of the substance are well recognized.

Nevertheless, phenol is a widely adopted and useful standard against which the relative potencies of other compounds are measured. Hence the term phenol coeflicient or as abbreviated, the PC factor of the substance compared as used herein, is the unit of measure by which is indicated the relative weight of the substance in solution by comparison with the phenol concentration required to exercise the same degree of growth-inhibiting activity against a given species of microorganism under the same conditions of testing.

The antimicrobial properties of cetyl pyridinium halogen salts, per se, have been recognized heretofore, the chloride salt having been shown to be antiseptic, as by Sarber, J. Pharmacol., 74, 227, 1942. Antifungal properties of the bromide have been employed in a medication proposed by Ingmar Mansson, Medlemsblad for Sveriges Veterinarforbund, nr. /1959.

3,787,566 Patented Jan. 22, 1974 Citral, which is a relatively common terpene aldehyde found in the volatile oil of lemon, lemon grass, and orange, has long been known and widely used as a flavoring agent in foods and beverages. Recent findings of its bactericidal and antifungal properties are published by Zibister, D. E. in Russian publication Zh. Mikrob. Epid. i Immunobiol, 7, 15-18, 1960. The germidical eflicacy of a few other aromatic oils has been indicated in papers such as that of Mose, J. R. and Lukes, G., Arzneimittel Forsch, 7, 687-92, 1957.

Phenols and many phenolic compounds cannot be effectively dispensed in an aerosol air santizer in high concentration due to the irritating effect of the phenol and phenolic compounds on plants, animals and humans, particularly in the nasal and throat passages. Accordingly, phenol is often employed in aerosol compositions in residual-type sprays; that is, aerosol or pump-type sprays dispensing relatively large particle sizes; for example, over microns, which do not remain airborne for long periods of time, or if employed in air sanitizers, must be employed in combination with other ingredients to modify their elfects or in low nonirritating concentrations. In addition, many quaternary ammonium compounds, such as the alkyl benzyl dimethyl ammonium chlorides, when applied in a spray form, through mist devices or aerosol or pump sprays cause an adverse reaction in humans, such as an irritating effect or feeling of dryness in the nasal and throat passages. The empolyment of aerosol or sprayable compositions is an efiective means in whicn to provide a wet; that is, a residual-type spray, or an air sanitizer-type spray.

SUMMARY OF THE INVENTION My invention relates to aerosol antiseptic and disinfecting compositions for inhibiting the growth of microorganisms, particularly fungi and bacteria. More particularly, my invention relates to foamable and sprayable disinfecting compositions comprising a propellant and including as one active constituent a halide salt of a pyridinium compound and as a second active constituent a member of the group of organic compounds all having ten carbon atoms consisting of the terpenes and their oxygenated derivatives. My aerosol composition containing said active components provides synergistic bacteriostatic action against a wide variety of microorganisms. My disinfecting composition may be effectively employed both in foam-dispensing aerosol containers as well as in air sanitizers and residual-type aerosol spray dispensers, both at high and low pressure and with a variety of valve dispensing devices and valve orifice openings. My aerosol compositions are particularly useful, since due to the synergistic coaction of the active ingredients, low concentrations of the active ingredients; for example, less than 1000 ppm, such as less than 325 ppm, may be used, considerably reducing toxicity hazards from the active ingredients and any other adverse human efrects due to the ingredients in the atmosphere or in topical applications. I have found that my aerosol compositions employed in air sanitizers may be sprayed into the air, and in general, are nontoxic and are not accompanied by any immediate irritating or ad- 'verse effect on persons walkingthrough such air-borne particles.

My compositions which are employed in aerosol containers comprise propellants, such as those propellants normally employed as aerosol propellants, a halide salt of a pyridinium compound and a terpene or an oxygenated derivative thereof, as well as other additives, either as carriers like water or alcohol or combinations thereof, or as additives to eifect the desired degree of dryness or to enhance or add to the disinfectant actions of the active ingredients.

I have discovered that the halogen salts of alkyl and alkenyl-substituted pyridinium particularly the chloride iodide and the bromide salts thereof, in admixture with a member of the group of isoprenoid compounds consisting of the monocyclic, bicyclic and acyclic monoterpene hydrocarbons and their alcohols, ethers, acids, aldehydes, ketones, and other oxygenated derivatives are synergistic with each other and greatly augment and improve upon the specific anitmicrobial properties attributable to the separate constituents. Relatively dilute solutions of the salt and of the monoterpene compound, each present in a concentration of the order of a few parts per million, are eflicacious as disinfectants and for inhibiting the growth of a wide range of microorganisms.

An object of my invention is to provide sprayable and foamable aerosol disinfecting products and compositions, as well as aerosol packages containing such compositions, which compositions utilize a synergizing effect manifested by admixtures of a pyridinium halide salt and a monoterpene whereby aerosol sprays, both residual and air sanitizing and foams may be realized with high antimicrobial activity at relatively low cost and having relatively low toxicity effects at the highest concentrations required for destruction of a wide range of microorganisms.

The first constituent active substance of my disinfecting composition may be chosen from the halide salts (iodide, fluoride, chloride and bromide or combinations thereof) of N-aliphatic pyridinium compounds such as the alkyl and alkenyl N-pyridinium halide salts, particularly those derived from long-chain; e.g. C -C fatty alcohols. The preferred pyridinium halides are the chlorides and bromides, and particularly preferred compounds are cetyl and lauryl pyridinium bromide and chloride. Typical pyridjnium halide salts which may be employed would include but not be limited to cetyl pyridinium bromide, cetyl pyridinium chloride, lauryl pyridinium chloride, lauryl pyridinium bromide. Typical N-substituent groups would include, but not be limited to, C -C groups, saturated or unsaturated, octyl, nonyl, methyl, ethyl, butyl, propyl, cyclohexyl, decyl, dodecyl, cetyl, lauryl, stearyl, oleate, myristate, etc., and the like. The selection of the particular substituent group is often based upon the degree and nature of water solubility desired and whether the compound is to be employed with emoluments, nonionic surface-active agents and the like.

The second constituent substance of an antiseptic composition according to my invention may be chosen from among a relatively large group of organic compounds having structures containing the repeating isoprene structural pattern, which are classed as terpenes and generally designated C H and their oxygenated derivatives generaliy designated C H O and C H O. The class includes the terpene hydrocarbon compounds m-cymene and p-cymene, C H and among the oxygenated derivatives are included the compounds numerically designated m n 10 14 2 1o 2o and ro zo z The monoterpenes have been defined succinctly in the chemical arts; see textbook Organic Chemistry by Fieser and Fieser, published by C. C. Heath and Company, Boston, U.S.A. Among the acyclic forms of the class are: myrcene; ocimene; the isomers of citral-neral and geranial; citronellal; nerol; geraniol; citronellol; and linalool. The monocyclic monoterpenes consist of: p-cymene; limonene; terpinolene; terpinene; phellandrene; terpinol; terpincol; menthol; thymol; piperitol; isopulegol; carvacrol; carvomethol; carveol; perillaldehyde; phellandral; menthone; pulegone; isopulegone; piperitone; carvomenthone; carvone; dihydrocarvone; carvotanacetone; diosphenol; cineole; ascaridole; m-cymene; and sylvestrene (carvestrene). Bicyclic monoterpenes consist of thujene; sabinene; car-S-ene and car-4-ene; pinene; camphene; fenchene, thujyl alcohol; sabinol, thujone; umbellulone; carone; myrtenal; myrtenol; pinocamphone; pinocampheol; camphor; camphorquinone; borneol; fenchone; and

fenchyl alcohol. Many of the foregoing compounds have stereo-isomer forms.

Compositions formulated to combine a pyridinium halide and a monoterpene organic compound are ideally suited for aerosol atmospheric or topical application in the treatment of infections by microorganisms in man and animals both on skin surfaces and on mucous membranes, when dissolved or dispersed in a suitable compatible carrier. An exceedingly large number of combinations are possible, depending on the mode of use intended, kind of vehicle in which the active ingredients are dissolved or suspended, and the nature of further additives which may be incorporated for therapeutic purposes. The ratio of concentrations of the halide salt and of the monoterpene may be varied widely, the latter preferably but not necessarily being present in somewhat greater concentration than the former. Effective ratios of the halide salt to themonoterpene, by weight, may range from about 1:3000 to about 3000: 1. It will be understood that optimum ratios will lie generally intermediate the extremes of the range indicated, and the highest enhancement an antimicrobial activity will in most of the possible combinations be realized with the monoterpene present in the proportion of a small multiple of the weight of the halide salt. The weights of the active ingredients may, for example, bear a weight ratio between 1:300 and 300:1; e.g., 1:50 and 50:1. Compositions for inhibiting the growth of microorganisms may comprise from about 2 to 150 parts; e.g., 5 to 50, per million of the terpene and from 5 to about 600; e.g., 25 to 350, parts per million of a pyridinium halide. For example, in compositions particularly for vaginal or other topical use in an aerosol spray or foam, the active ingredients may comprise, for example, from 1 to to about 1 to 50% by weight of a pyridinium, such as cetyl pyridinium, bromide, and from about 1/ 200% to about 1/ 100% by weight of the monoterpene, such as citral.

My active disinfectant ingredients may be placed in liquid or solid compositions, including a variety of carriers so that they may be dispensed in spray or foam form for the use of aerosol-type propellants. A variety of propellant compounds may be employed, but typically, the propellants are the liquidfied compressed gases generally used to utilize as aerosol propellants. These propellants may be broadly categorized as halocarbons, such as fluorocarbons and chlorocarbons, and low molecular weight hydrocarbons, such as butane and propane, which are liquid under container pressures which may range from 20 to 300 p.s.i.g. Compressed gases, such as carbon dioxides, the oxides of nitrogen, such as nitrous oxide, and nitrogen may also be used to dispense my compositions. Such gases are included in the term liquified gaseous aerosol propellant" as used herein. Often, combinations of propellants are employed to obtain the proper degree of pressure and for formulating reasons. Hydrocarbons are generally flammable and sometimes explosive, and therefore, fluorocarbons are often the preferred propellants. Generally in spray compositions, the propellants will comprise at least 50% of the total aerosol composition; for example, 50 to 70 for residual sprays and 50 to 92 for air sanitizers. When a compressed gas is used in combination, the combination will often comprise at least 20% of the total aerosol composition. When a foamable composition is employed, for example, an aqueous composition containing a soap like potassium fatty acid soap, then the propellant often comprises from 5 to 20% of the composition; e.g., 8 to 12%.

The fluorohydrocarbon propellants are generally chlorinated and fluorinated hydrocarbons and include trichloromonofluoromethane, dichlorodifluoromethane, dichloromonofluoromethane, monochlorodifluoromethane, trrchlorotrifluoroethane and dichlorotetrafluoroethane. Of the foregoing mixtures of dichlorodifiuoromethane with trichloromonofluoromethane are the preferred propellants.

In addition to the active ingredients and the propellant, my aerosol compositions may also contain uarymg amounts of other additives which may be admixed in appropriate quantities in the formulating compositions, which additives would include humectants, suspending agents, bases for ointments and lotions, granulating vehicles, soaps, emoluments, bulk carriers, surfactants, etc. While obviously destructive additives would not be added by those skilled in the chemical arts, the stability of the active ingredients cannot be assured unless the formulation is essentially free of anionic substances. For example, nonionic surfactants and compounds and some cationic substances are compatible with the active ingredients so that choices may generally be directed accordingly in selecting the appropriate vehicles. Typically, my formulations may include soaps, such as the sodium, potassium, ammonium and other metal soaps of fatty acids, such as potassium stearates, oleates and the like, and nonionic surfactants, such as, for example, the alkylarylpolyether alcohols, sulfonates and sulfates, such as, for example, the octyl and nonyl phenoxypolyethoxyethanols known by the trade name. Triton, which compounds may have from 10 to 80 polyethoxy groups as desired. Another typical synthetic nonionic low-foaming detergent or surfactant suitable for use with the active ingredients of my invention would include polyoxyethylene derivatives of fatty acids, partial esters of, for example, hexatol anhydrides known in the trade as Tweens. I have found that the formulation known as Tween 20 in amounts ranging from about 1 to 20% by weight in an aqueous composition are effective for dispersing the active ingredients. Typical surfactants that are employed include, for example, 1 to 8% by weight of polyethoxyethylene sorbitan, monopalmitate, monolaureate and other fatty acid and alcohol derivatives. In addition, it is often useful to include in my formulations various chelating agents, particularly in aqueous formulations where the product is to be employed in hard water areas. Typical chelating agents would include ethylene diamine tetracetic acid, and sodium and potassium salts of ethylene polyamines, such as the disodium salt of ethylene diamine tetracetic acid in amounts ranging from about 0.01 to 2.0% of the formulation.

Typical additives employed in both air sanitizing and residual-type sprays for additional disinfectant qualities, as well as to control the humectant and degree of drying characteristics are polyols, such as the alkylene glycols, such as triethylene glycol, dipropylene glycol, propylene glycol, ethylene glycol and the like. Polyols are often employed in amounts ranging from about 0.5 to 12% by weight of the formulation; e.g., to 10. Typically, polyols are employed in those aerosol compositions which contain an alcohol carrier, such as isopropyl alcohol or anhydrous ethyl alcohol, but may also be employed for their emolument and humectant properties in aerosol foamable compositions in combination with various surfactants and soaps. Bases for ointments and lotions containing the active ingredients would include polyethylene glycols and methoxypolyethylene glycols having a molecular weight generally ranging from 200 to 20,000 and identified by the trade name, Carbowax. Typical granulation vehicles for my ingredients include gelatin, while emoluments include various fatty acids and alcohols, waxes, lanolin, paraffin and the like. Base carriers for my formulation include sugars like lactose, starches and other powdered inert ingredients. Other additives would include oils, perfumes, etc.

Substances particularly effective to allay the inflammation attending infections may desirably be added to my disinfecting compositions, particularly for topical use; for example, on mucous membranes or on skin, to promote healing, while the invading microorganisms are combated by the active ingredients. Steroids, specifically 17 alphahydroxycorticosterone and hydrocortisone and its therapeutically active derivatives are eminently suitable.

In the formulation of disinfectant spray aerosol compositions, water or alcohol or combinations thereof may be employed as desired; however, in air sanitizing-type sprays, typically the formulation would include the active ingredients glycol, alcohol and a propellant formula at the desired pressure and employed with a suitable spray valve opening; for example, 0.010 to 0.025 inch under pressure sealed in an aerosol container.

The specific antimicrobial activity of the relatively common monoterpene citral, consisting of its geometric isomers neral and geranial, against a number of microorganisms including the fungi and bacteria of Table I, is set out in Table II. The separate eflicacies of phenol and of citral, indicated by the concentrations of each at which growth is inhibited, establish the phenol coefficient of citral.

When the monoterpene aldehyde citral is admixed with a halide salt of cetyl pyridinium, the specific activity of the admixture in preventing or inhibiting growth of the fungi and bacteria previously tested is shown by Table HI to be strikingly and inexplicably enhanced in all instances. In this table are listed the phenol coeflicients of cetyl pyridinium bromide alone, of cetyl pyridinium chloride alone, of citral alone, and of the combinations of each halide salt with citral, wherein the citral concentrations respectively are 20 p.p.m. and 10 p.p.m. As will be immediately apparent, the admixture of the two ingredients produces an improvement in antimicrobial activity which in some cases is more than a thousand times that of either constituent alone. This clearly demonstrates that a strong synergistic potentiation is achieved. The antimicrobial potency is far greater than may be accounted for by merely summing the PC factors of the ingredients. That the enhancement is wholly the result of synergistration of antimicrobial activity may be understood from a simple inspection of the data, which shows a PC for the admixture which is a multiple of the aggregate of the separate PC factors. For example, the composition consisting of cetyl pyridinium bromide and citral has a synergized antimicrobial activty against Candida albicans wherein the PC factor is more than six times as large as the product of the individual PC factors of the separate constituents, and more than forty-seven times as large as their aggregate.

It will also get apparent that effective concentrations of the composition are low. The substance citral is itself a harmless food substance. The concentration of cetyl pyridinium bromide lethal to resistant microorganisms such as Staphylococcus awreus ATCC #11631 in admixture with citral is so low that it might be ingested with complete safety. Tests carried out show that even enormously higher concentrations are relatively safe for animals.

The composition when appropriately formulated is clearly ideally suited to the treatment of infections by microorganisms in animals and man, both on skin surfaces and on mucous membranes.

Monoterpenes chosen from the list given hereinabove when tested for synergism in combination with cetyl pyridinium halide salts, were found to produce excellent improvements of antimicrobial activity, in some instances the enhancement being superior to that obtained by combining citral with the salt. Table IV shows PC factors calculated when a fixed concentration of the monoterpene was admixed with amounts of cetyl pyridinium bromide increasing upwards from 0.0 p.p.m. and added to the culture media inoculated with the fungus Trichoderma sp. ?645, a causative organism for the ailment athletes oot.

This fungal microorganism was selected in view of its relatively high resistance to phenol, and because its mode of growth in surface skin layers of the body presents a locate difficult of treatment by reason of absorption of phenol in intact surface tissue.

Table IV shows that whereas cetyl pyridinium bromide has a PC alone of 3.33 (Table HI), each of thirteen monoterpene additives chosen at random out of the possible compounds embraced within the class of acyclic, monocyclic and bicyclic monoterpenes and their oxygenated derivatives, produced startlingly effective antiseptics and antifungal compositions with respect to the microorganism. The random test included citronellal, citronellol, eucalyptol, fenchone, geraniol, linalool, menthol, nerol, pcymene, pinene, pulegone, terpineol, and thymol, representing hydrocarbons, aldehydes, alcohols, ketones, and other oxygenated forms derived from monoterpene hydrocarbons. The PC values obtained ranged from 106.5 to 444, when 20 ppm. of the additive were employed.

The following specific formulations and particularly the aerosol formulations are proposed to illustrate rather than to limit the practice of the invention and it will be apparent that ointments, jellies, creams, lotions, sprays, sanitizing and cleansing preparations, paints and waxes, and other forms of sprayable and foamable compositions may be varied extensively from the exact proportions given in the examples. It will be understood that the ingredients specified should be admixed in accordance with approved pharmaceutical techniques when formulated as medications. The formulations not shown in combination with aerosol propellants may be readily adapted to be dispensed in the desired form by an aerosol container by a propellant.

It is moreover advisable to protect compositions from prolonged exposure to light and heat.

EMBODIMENTS OF THE INVENTION Antiseptic solution:

Cetyl pyidinium bromide mg 10 Monoterpene hydrocarbon or oxygenated derivatives (e.g., citral) mg 40% ethyl alcohol ml 100 The solution is protected from light and heat and is used full strength for antifungal and antibacterial control directly on skin and mucous surfaces, wounds, and in disinfecting articles and utensils, or it may be diluted with up to times its volume of water. This composition may be pressurized in an aerosol container having a spray-type sealed valve to 100 to 120 p.s.i.g. with nitrogen gas and dispensed as an aerosol spray.

Lotion:

Carbowax 400 grams.. 45 Propylene glycol ml Cetyl pyridinium bromide mg 10 Citral m 5 Water, up to 100 ml.

This lotion as well as the following lotion and ointment formulation may be pressurized in an aerosol container with a fluorocarbon propellant mixture, such as 50/50 Freon '12/ 114 to a pressure of 80 to 100 p.s.i.g., employing 6 to 15 weight percent of the propellant mixture and be dispensed as a lotion through a foam-type aerosol Compositions combining the antimicrobial activities of the active ingredients of the invention, with the antipruritic and antiinflammatory properties of hydrocortisone are set out in the following exemplary embodiments.

Lotion:

Carbowax 400 grams 45 Propylene glycol ml 15 Cetyl pyridinium bromide mg 10 Cit-ral mg 5 Hydrocortisone gram 0.5 Water, up to 100 ml.

Ointment:

Paraffin grams 40 Lanolin do 10 Liquid paraffin do 60 Lauryl pyridinium chloride mg 20 'Citral mg 10 Hydrocortisone gram 1 Lotion:

Carbowax 400 grams 40 Propylene glycol do.. 20 Lauryl pyridinium bromide do 15 Thymol mg 7 Water, up to ml.

Room surfaces, as in houses, hospitals, and institutions may be sanitized by use of a detergent cleaning compound as indicated below, wherein the ingredients are present in the relative weight proportions indicated.

Detergent sanitizer: Percent Nonionic low foaming detergent 10 Cetyl pyridinium bromide 2 Citral 1 Water 87 The above composition, diluted with water in the proportion of one pound per 200 to 250 pounds, provides a potent nontoxic antiseptic Wash devoid of any objectionable smell. This formulation may be dispensed as a residual aerosol spray by an aerosol propellant.

Water solutions of the detergent sanitizer compound may be prepared in the strength of one pound per 100 pounds water, and applied to textiles, paper webs in paper mills, and printing rollers and blankets, by spraying or atomizing the solution.

When added to tanks in a proportion of from about 50 to about 200 parts per million, the sanitizer preparation above is effective for the control of slime-forming microorganisms and algae. Stronger concentrations are well suited to treatment of foot baths in shower rooms.

Aerosol air sanitizer: Weight percent Cetyl pyridinium bromide 0.0625 Citral 0.0125 Triethylene glycol 4.0000 Dipropylene glycol 4.0000 Isopropyl alcohol 16.9250 Propellant 50/50 Freon 11/ 12 75.0000

Aerosol air sanitizer:

Lauryl pyridinium bromide 0.0500 Thymol 0.0100 Propylene glycol 2.0000 Triethylene glycol 3.0000 iAnhydrous ethyl alcohol 19.9400 [Propellant 50/50 Freon 11/ 12 75.0000

Aerosol air sanitizer:

Cetyl pyridinium chloride 0.0625 Citral 0.0025 Propylene glycol 2.5000 Triethylene glycol 4.0000 Isopropyl alcohol 8.4350 Propellant 85.0000

Aerosol air sanitizer:

Lauryl pyridinium bromide 0.0750 Citral 0.0075 SDA #40 anhydrous ethyl alcohol 0.5000 Hexylene glycol 2.4175

Dichloride fluoromethane propellant (Freon 12) 97.0000

The degree of dryness of the air sanitizer formulations is regulated by adjustment in the polyol and alcohol amounts as follows:

Combine the above formula with 15% of a propellant Freon 50/50 Fl2/F114 mixture in an aerosol container. The above formulations may also be employed as a p t feminine hygiene vaginal foam or spray. Such feminine Triethylene glycol 5 hygiene formulation may include Carbowax 1000 an Di to ylene glycol 4000 as carriers as well as small amounts of hydrog g 8 049 cortisone, for example, as above.

Aerosol vaginal foam:

Residual aerosol formulation: Surfactant-Triton 400 3.000 Cetyl pyridinium bromide 0.0250 Carbowax 4000 3.000 Citral 0.0020 Carbowax 1000 6.000 Polyoxyethylene monopalmitate 0.2000 FW Pyndlmum bromide 0-200 Disodium salt of ethylene diamine C1131 0.050

tetracetic acid 0.0065 gi f 2- 2? Water 99.7665 100.000

100-0000 Pressurize with nitrogen to 100 to 125 p.s.i.g.

TABLE I Concentration 0!- Cone. Ceytl ofeetyl Phenol pyridinium pyridinium for chloride for bromide for m control, control, control,

cro-organlsm p.p.m. p.p.m. PC p.p.m. PC 'Irl h a .ATCC 5 Tri ofihit x ni ltagrophyt TACC 9533- "'I 3? 33 2'2 3 28 Microsporum gypsum ATCC 10215 Tricophytcm mentagrophytes AICd fiIS ti Tritirachiam purp'areum ATC Microsporum audoum' AICC 11347 gricgghytojfjonsurans ATCC 10217- Staphylococcus aureus .ATCC 6538 p4 Staphylococcus aureus ATCC 11631 Proteus mllgaris ATCC 6380 Shigella dysenteriae ATCC 11835.

Salmonella typhosa ATCC 6539.- Diplococcus pneumoniae ATCC 6303 P.p.m.: parts per million. P C: phenol coetficient.

The above formulation is sealed in a seamless one- TABLE H pound tin-plated aerosol container containing an aerosol Concentration valve having a surface of 0.015" sealed therein, and the 3 23? ag e iii PC I n formulation pressurized to 100 to 120 p.s.i.g. with nitrogen Microorganism g ffi j for 3,; f s. Triohoderma SI). ATCC 9645 666 33a 2. 0

Tncophyton mentagrophytea ATCC Aerosol hair grooming foam: Weight percent 9 000 333 6.0 Mzcrosporum gypseu'm ATCC 10215.. 400 'SurfactantTr1ton 400 3.000 Tricophyton mentaarophytes ATOC 11480 533 83 6. 42 Lauryl pyrrdmium chloride 0.500 Tritirachium purpureum ATCC 0. l 0 025 11385 666 83 8.02 1 Fa lgicrosgort'umtaudounl 11 .32% 20. s 19. 611

ricop y on onsurans 20.8 19.6 lanohn'alcohol 1300 ggndhidla albicans u 2., 000 333 1 0 ap y ococcas aureus ,000 666 0 glyvmyl pynhdone Stayitylococcas aureus ATOC 6538 4 000 333 12 0 p cohol Proteus vulyaris ATCC 6380...- 4, 000 666 6.0 Water 58.800 Shigella dysenteriae ATGC 11835 2,000 666 3. o Salmonella typhosa ATCC 6539 2, 000 666 3.0 0003 0 pm ATCC 1 000 333 3 0 100.000

TABLE III Cone. of eetyl Concentration of cetyl pyridinium pyridinium bromide chloride for for control, when 10, control, when 20 p.p.m. terpene 20 p.p.rn. terpresent (citral) C of PC of pene present; P0 of PC of CPB citral (citral) mixture 10 p.p.rn. 20 p.p.m. mixtures alone alone 25 26. 6 100 25 6. 66 26. 6 8. 33 2. 0 1. 56 1. 55 0. 7s 1, 282 2, 501 320 6. 0 25 12. 5 6. 25 32 64 9. 6 0. as 0. 38 1,366 1, 366 85. 2 6. 4. Microsporum audoam' .ATCC 11347 3. 12 0. 39 8. 2 1, 025 256. 4 19. 61 12.5 3. 12 320 1,282 20 12. 0 Staphylococcus aureus ATCC 11631 B 6. 25 b 3. 12 640 1, 280 6. 0 Shiaella dysenteriae ATCC 11835 12. 5 12. 5 160 160 160 3. 0

e 50 p.p.m. citral. b p.p.m. citral.

TABLE IV Fungal microorganism: Trichoderma sp. .ATCC #9645; phenol coefliclent for cetyl pyridinium bromide: 3.3

Days elapsed to commencement of growth in culture containing cetyl pyridinium bromide in concentration given PC for Monoterpene additive in culture, 20 6.25 3.15 1.5 0.78 0.36 0.0 compop.p.m. of each p.111. p.p.m ppm. p.p.m. ppm. p.p.m. sition Citronellal 10 3 444 Citronellol- 5 5 5 4 3 106. 5 Eucalyptol- 5 5 5 55 3 106. 5 Fenchoma" 3 3 3 444 erani 3 38 3 444 Linalool.-. 3 3 3 444 Menthol- 7 5 5 3 211. 4 iz 3 g g g 21% en l ingr i n. 5 3 3 444 Pulegone 5 3 3 444 Terpineol 5 5 3 3 211. 4

hymol 7 3 3 Denotes no observable growth in days.

Many other applications and modes of use will suggest themselves to one skilled in the art, and the practice of the invention is extended to every such application, vehicle, and mode of use without restriction, except as set out hereinafter by the appended claims.

What is claimed is:

1. A disinfectant aerosol which comprises an aerosol container and means to dispense under pressure the contents of the container, the contents comprising an effective amount of a liquified gaseous aerosol propellant, and a bacteriostatically and fungistatically elfective amount of a composition consisting essentially of as active ingredients, a halide salt of cetyl pyridinium and a monoterpene selected from the group of isoprenoid compounds con sisting of the monocyclic, bicyclic and acyclic monoterpene hydrocarbons and their alcohol, aldehyde, ketone, acid, ether and other oxygenated derivatives, which contain the repeating isoprene structural pattern and are represented by the formulas cmH g, CmHmO, CmHmO, m m 10 14 m n z, m -zu and m m 'A the weight of the active ingredients having a ratio of between about 1:50 and 50:1; and a carrier selected from the group consisting of water, alcohol, and mixtures thereof for the active ingredients whereby the propellant provides for the dispensation from the aerosol container of the active ingredients and carrier.

2. The product of claim 1 wherein the monoterpene is selected from the group consisting of citronellal, citronellol, eucalyptol, fenchone, geraniol, linalool, menthol, nerol, p-cymene, pincne, pulegonc, terpineol, thymol and citral.

3. The product of claim 1 wherein the active ingredients comprise cetyl pyridinium bromide and citral.

4. The product of claim 1 which includes from about 0.5 to 12.0% by weight of an alkylene glycol selected from the group consisting of triethylene glycol, dipropylene glycol, propylene glycol, ethylene glycol and hexylene glycol.

5. The product of claim 1 which includes hydrocortisone.

6. The product of claim 1 which includes a polyoxyethylene derivative of a fatty acid low foaming nonionic detergent.

7. The product of claim 1 which includes water as a carrier and which contains a chelating agent selected from the group consisting of ethylene diaminetetraacetic acid and the sodium and potassium salts thereof.

8. The product of claim 1, wherein the carrier includes an aliphatic monohydric alcohol containing two to three carbon atoms.

9. The product of claim 1 wherein the means to dispense the product is a spray-type valve, whereby the product is dispensed in spray form.

10. The product of claim 1 wherein the means to dispense the product is a foam dispensing-type valve whereby the product is dispensed in a foam form.

11. A disinfectant aerosol spray product which comprises an aerosol container which includes a valve to dispense the contents of the container in spray form, the container having therein:

(a) a liquified gaseous aerosol propellant;

(b) an alcohol carrier; (-0) an alkylene glycol; and (d) a bacteriostatically and fungistatically eifective amount of a composition consisting essentially of active ingredients citral and a halide salt of cetyl pyridinium selected from the group consisting of the chloride and bromide salts, the weights of said active ingredients having a ratio between about 1:50 and 50:1.

References Cited UNITED STATES PATENTS 3,287,214 11/ 1966 Taylor et al. 424-45 3,131,153 4/1964 Klausner 252-305 3,595,975 7/ 1971 Gauvreau 424-263 OTHER REFERENCES Merck Index, 7th ed., 1960, p. 227. Merck Index, 7th ed., 1960, p. 130. Chemical Abstract, 47:10618i (1953).

Chemical Abstract, 49:11091f (1955). Modern Drugs, 8th ed., 1961, p. 1037.

ALBERT T. MEYERS, Primary Examiner L. SCHENKMAN, Assistant Examiner US. Cl. X.R. 

